CA2448064A1 - Filtering strength determination method, moving picture coding method and moving picture decoding method - Google Patents

Filtering strength determination method, moving picture coding method and moving picture decoding method Download PDF

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CA2448064A1
CA2448064A1 CA002448064A CA2448064A CA2448064A1 CA 2448064 A1 CA2448064 A1 CA 2448064A1 CA 002448064 A CA002448064 A CA 002448064A CA 2448064 A CA2448064 A CA 2448064A CA 2448064 A1 CA2448064 A1 CA 2448064A1
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picture
filtering
current block
block
filtering strength
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CA2448064E (en
CA2448064C (en
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Teck Wee Foo
Chong Soon Lim
Sheng Mei Shen
Shinya Kadono
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Panasonic Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

A moving picture coding apparatus includes ( i ) an inter-pixel filter (114) having the following filters for filtering decoded image data so as to remove block distortion which is high frequency noise around block boundaries: a filter A114a; a filter B114b, a filter C114c, a filter D114d, each having a different filtering strength, and ( ii ) a filter processing control unit (110) for determining a filtering strength of the inter-pixel filter (114).

Claims (21)

1. A filtering strength determination method for determining a strength of filtering to remove coding distortion between blocks that constitute a picture, comprising:
a parameter obtainment step of obtaining parameters that are coding information regarding a coded current block and a coded neighboring block adjacent to said current block;
a comparison step of making a comparison between the parameters of the current block and the neighboring block, when a picture including said current block and said neighboring block is a picture employing inter picture prediction coding using two reference pictures; and a determination step of determining a filtering strength, based on a comparison result obtained in the comparison step.
2. The filtering strength determination method according to Claim 1, wherein the parameters include coding mode information of the blocks, the comparison step includes a picture number judgment step of judging whether the number of reference pictures referred to by the current block and the number of reference pictures referred to by the neighboring block are the same or not, based on the respective coding mode information of the current block and the neighboring block, and the filtering strength which differs depending on a judgment result obtained in the picture number judgment step is determined in the determination step.
3. The filtering strength determination method according to Claim 2, wherein the parameters further include reference indices for uniquely identifying reference pictures, the comparison step further includes a reference picture judgment step of judging whether or not the current block and the neighboring block refer to a same reference picture, based on the respective reference indices of the current block and the neighboring block, and the filtering strength which differs depending on a judgment result obtained in the reference picture judgment step is determined in the determination step.
4. The filtering strength determination method according to Claim 3, wherein the reference picture judgment step is executed when the judgment result obtained in the picture number judgment step shows that the number of reference pictures referred to by the current block and the number of reference pictures referred to by the neighboring block are the same.
5. The filtering strength determination method according to Claim 3, wherein the parameters include motion vectors with respect to a reference picture, the comparison step further includes a motion vector judgment step of judging whether or not at least one of the following differences is a predetermined value or larger, based on the motion vectors included in the current block and the neighboring block: a difference between a horizontal component of an arbitrary one of the motion vectors of the current block and a horizontal component of an arbitrary one of the motion vectors of the neighboring block;
and a difference between a vertical component of an arbitrary one of the motion vectors of the current block and a vertical component of an arbitrary one of the motion vectors of the neighboring block, and the filtering strength which differs depending on a judgment result obtained in the motion vector judgment step is determined in the determination step.
6. The filtering strength determination method according to Claim 5, wherein the motion vector judgment step is executed when the judgment result obtained in the reference picture judgment step shows that the current block and the neighboring block refer to the same reference picture.
7. The filtering strength determination method according to Claim 1, wherein the parameters include reference indices for uniquely identifying reference pictures, the comparison step includes a reference picture judgment step of judging whether or not the current block and the neighboring block refer to a same reference picture, based on the respective reference indices of the current block and the neighboring block, and the filtering strength which differs depending on a judgment result obtained in the reference picture judgment step is determined in the determination step.
8. The filtering strength determination method according to Claim 7, wherein the reference indices r espectively include a first reference index and a second reference index, and a judgment is made in the reference picture judgment step on whether the following are satisfied or not: the number of reference pictures referred to by the current block and the number of reference pictures referred to by the neighboring block are the same; and the respective reference indices of the current block and the neighboring block indicate a same reference picture.
9. The filtering strength determination method according to Claim 1, wherein the parameters include motion vectors with respect to a reference picture, the comparison step includes a motion vector judgment step of judging whether or not at least one of the following differences is a predetermined value or larger, based on the motion vectors included in the current block and the neighboring block: a difference between a horizontal component of an arbitrary one of the motion vectors of the current block and a horizontal component of an arbitrary one of the motion vectors of the neighboring block; and a difference between a vertical component of an arbitrary one of the motion vectors of the current block and a vertical component of an arbitrary one of the motion vectors of the neighboring block, and the filtering strength which differs depending on a judgment result obtained in the motion vector judgment step is determined in the determination step.
10. The filtering strength determination method according to Claim 9, wherein a judgment is made in the motion vector judgment step on whether each difference between the respective motion vectors of the current block and the neighboring block is a predetermined value or larger, when the following are satisfied: the number of reference pictures referred to by the current block and the number of reference pictures referred to by the neighboring block are the same; and the respective reference indices of the current block and the neighboring block indicate a same reference picture.
11. The filtering strength determination method according to Claim 1, wherein the neighboring block in the parameter obtainment step is a block vertically above on the picture when the filtering is applied in a vertical direction, and a block horizontally to the left on the picture when the filtering is applied in a horizontal direction.
12. The filtering strength determination method according to Claim 1, wherein one filtering strength is determined in the determination step from among a plurality of strengths which are set in advance as filtering strengths.
13. The filtering strength determination method according to Claim 1, wherein a judgment is made in the comparison step on whether or not the picture including the current block and the neighboring block is a picture employing inter-picture prediction coding using two reference pictures, when the following are satisfied: neither the current block nor the neighboring block is intra-coded; and coefficients indicating spatial frequency components resulted from orthogonal transform are not coded.
14. A filtering strength determination method for determining a strength of filtering to remove coding distortion between blocks that constitute a picture, comprising:
a parameter obtainment step of obtaining a picture type of a picture that includes a coded current block and a coded neighboring block adjacent to said current block; and a determination step of determining a stronger filtering strength than in a case where the picture type obtained in the parameter obtainment step indicates inter picture prediction coding using one reference picture, when said picture type indicates inter picture prediction coding using two reference pictures.
15. A moving picture coding method for coding each of pictures making up a moving picture on a block-by-block basis, comprising:
a filtering step of applying filtering on a boundary between the current block and the neighboring block by the use of a filtering strength determined using the filtering strength determination method according to Claim 1.
16. A moving picture decoding method for decoding coded moving picture data in which each of pictures making up a moving picture has been coded on a block-by-block basis, comprising:
a filtering step of applying filtering on a boundary between the current block and the neighboring block by the use of a filtering strength determined using the filtering strength determination method according to Claim 1.
17. A filtering strength determination apparatus for determining a strength of filtering to remove coding distortion between blocks that constitute a picture, comprising:
a parameter obtainment unit operable to obtain parameters that are coding information regarding a coded current block and a coded neighboring block adjacent to said current block;
a comparison unit operable to make a comparison between the parameters of the current block and the neighboring block, when a picture including said current block and said neighboring block is a picture employing inter picture prediction coding using two reference pictures; and a determination unit operable to determine a filtering strength, based on a comparison result obtained by the comparison unit.
18. A filtering strength determination apparatus for determining a strength of filtering to remove coding distortion between blocks that constitute a picture, comprising:
a parameter obtainment unit operable to obtain a picture type of a picture that includes a coded current block and a coded neighboring block adjacent to said current block; and a determination unit operable to determine a stronger filtering strength than in a case where the picture type obtained by the parameter obtainment unit indicates inter picture prediction coding using one reference picture, when said picture type indicates inter picture prediction coding using two reference pictures.
19. A moving picture coding apparatus for coding each of pictures that make up a moving picture on a block-by-block basis, comprising:
a filtering unit operable to apply filtering on a boundary between the current block and the neighboring block by the use of a filtering strength determined using the filtering strength determination method according to Claim 1.
20. A moving picture decoding apparatus for decoding coded moving picture data in which each of pictures making up a moving picture has been coded on a block-by-block basis, comprising:
a filtering unit operable to apply filtering on a boundary between the current block and the neighboring block by the use of a filtering strength determined using the filtering strength determination method according to Claim 1.
21. A program for determining a strength of filtering to remove coding distortion between blocks that constitute a picture, the program causing a computer to execute steps included in one of the filtering strength determination methods according to Claims 1~14.
CA2448064A 2002-07-11 2003-06-26 Filtering strength determination method, moving picture coding method and moving picture decoding method Expired - Lifetime CA2448064C (en)

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JP2002202796 2002-07-11
JP2002-202796 2002-07-11
PCT/JP2003/008070 WO2004008773A1 (en) 2002-07-11 2003-06-26 Filtering intensity decision method, moving picture encoding method, and moving picture decoding method

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